<div class="button-wrapper">
  <button type="button" class="btn btn-default  btn-xs">Default</button>
</div>
<div class="button-wrapper">
  <button type="button" class="btn btn-primary  btn-sm">Primary</button>
</div>
<div class="button-wrapper">
  <button type="button" class="btn btn-success btn-mm">Success</button>
</div>
<div class="button-wrapper">
  <button type="button" class="btn btn-info btn-md">Info</button>
</div>
<div class="button-wrapper">
  <button type="button" class="btn btn-warning btn-xm">Warning</button>
</div>
<div class="button-wrapper">
  <button type="button" class="btn btn-danger btn-lg">Danger</button>
</div>
